EP 2884311 B1 20170719 - ROAD SURFACE STATE DETECTION DEVICE AND ROAD SURFACE STATE DETECTION METHOD
Title (en)
ROAD SURFACE STATE DETECTION DEVICE AND ROAD SURFACE STATE DETECTION METHOD
Title (de)
VORRICHTUNG ZUR ERKENNUNG DES ZUSTANDS EINER STRASSENOBERFLÄCHE UND VERFAHREN ZUR ERKENNUNG DES ZUSTANDS EINER STRASSENOBERFLÄCHE
Title (fr)
DISPOSITIF DE DÉTECTION D'ÉTAT DE SURFACE DE ROUTE ET PROCÉDÉ DE DÉTECTION D'ÉTAT DE SURFACE DE ROUTE
Publication
Application
Priority
- JP 2012175865 A 20120808
- JP 2013070847 W 20130801
Abstract (en)
[origin: EP2884311A1] A radio waves receiving unit 1 receives horizontally polarized waves and vertically polarized waves of radio waves radiated from an object at a radiation angle. An image generation unit 2 generates a horizontally polarized waves image and a vertically polarized waves image based on the horizontally polarized waves and the vertically polarized waves, respectively. A polarization ratio calculation unit 3 calculates, for each radiation angle, a polarization ratio which is a ratio of intensity of the horizontally polarized waves to the vertically polarized waves based on the horizontally polarized waves image and the vertically polarized waves image. A refractive index calculation unit 6 calculates a refractive index of the object based on a change between polarization ratios of two different radiation angles. A road surface condition recognition unit 8 recognizes a condition of a road surface based on the refractive index.
IPC 8 full level
G01W 1/00 (2006.01); G01N 22/04 (2006.01); G01W 1/14 (2006.01); G06K 9/00 (2006.01)
CPC (source: CN EP US)
G01S 7/024 (2013.01 - EP US); G01S 7/411 (2013.01 - EP US); G01S 13/89 (2013.01 - EP US); G01W 1/00 (2013.01 - CN EP US); G01W 1/14 (2013.01 - EP US); G06V 20/56 (2022.01 - CN EP US); G01S 13/86 (2013.01 - EP US); G01S 2013/932 (2020.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2884311 A1 20150617; EP 2884311 A4 20151007; EP 2884311 B1 20170719; CN 104520735 A 20150415; CN 104520735 B 20160302; JP 5907271 B2 20160426; JP WO2014024763 A1 20160725; US 2015212199 A1 20150730; US 9341708 B2 20160517; WO 2014024763 A1 20140213
DOCDB simple family (application)
EP 13828642 A 20130801; CN 201380041971 A 20130801; JP 2013070847 W 20130801; JP 2014529457 A 20130801; US 201314419758 A 20130801